Spy2x11 Codename: Show Stopper [Christmas special]2x12 Behind the Scenes
If the technical-season-finale resolved most of the season's on-going plot threads, this resolves the rest -- including some stuff that's formed part of the backbone of the entire series. But it also definitively sets it up for a third run, so hurrah!
Plus, an uncommonly serious-minded making-of for a comedy show, but also good fun with it. Win-win.